Updated Changelog

Author: lcharette

CHANGELOG.md

@@ -5,6 +5,7 @@
 - Fix for undefined variable exception under strict mode in `ufAlerts` (#809)
 - Fix for site cache reset upon login (#828)
 - Changed global cache tag to proper prefix
+- Fix broken alert message in registration process (#843)
 
 ## v4.1.15-alpha
 - Refactor `Password` into a instantiable `Hasher` class, service, and `Password` facade (#827)